package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_CODE_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_CODE_TTL;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    //private RedisTemplate redisTemplate;


    @Override
    public Result sendCode(String phone, HttpSession session) {
        // 1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            // 2.如果不符合,返回错误信息
            return Result.fail("手机号格式错误!");
        }
        // 3.如果符合,生成验证码
        String code = RandomUtil.randomNumbers(6);
        // 4.保存验证码到session
        //session.setAttribute("code", code);
        session.setAttribute("phone", phone);
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);

        // 5.发送验证码
        log.info("发送验证码成功！验证码为：{}", code);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1.校验手机号,验证码
        String phone = loginForm.getPhone();
        String code = loginForm.getCode();
        Object cachePhone = session.getAttribute("phone");
        //Object cacheCode = session.getAttribute("code");

        // 获取redis缓存中的验证码
        Object cacheCode =  stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);

        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误!");
        } else if (!phone.equals(cachePhone)) {
            return Result.fail("手机号错误!");
        }
        if (cacheCode == null || !cacheCode.equals(code)) {
            return Result.fail("验证码错误!");
        }
        // 2.根据手机号查询用户
        User user = query().eq("phone", phone).one();
        // 3.判断用户是否存在
        if (user == null) {
            // 4.不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }

        // 生成随机token
        String token = UUID.randomUUID().toString(true);
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        // 将user对象转为map
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        // 保存用户到redis
        stringRedisTemplate.opsForHash().putAll(RedisConstants.LOGIN_USER_KEY + token, userMap);
        //设置token有限期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        // 1.创建用户信息
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        // 2.保存用户到数据库
        save(user);
        return user;
    }
}
